Running 24/7 since 2018.
My ISP is Lumos. Downtime is very rare (99.99% uptime)
My main server runs on a 500mbps connection.
Raspberry Pi 3 runs at 100mbps from a switch.
Downtime ranges from 1-2 days to a week at most, every year.
Power consumption is around $15-25 a year at most. The Dell system costed around $200.